CN108254645B - Device for detecting resistance of discharge - Google Patents
Device for detecting resistance of discharge Download PDFInfo
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- CN108254645B CN108254645B CN201810216632.XA CN201810216632A CN108254645B CN 108254645 B CN108254645 B CN 108254645B CN 201810216632 A CN201810216632 A CN 201810216632A CN 108254645 B CN108254645 B CN 108254645B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
- G01R31/013—Testing passive components
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Abstract
The invention relates to a device for detecting whether resistance is good or not, and belongs to the technical field of electronics. The invention comprises a resistance-removing socket, a combined multi-way switch circuit, a combined multi-way switch control circuit, a window voltage comparator, a 555 multivibrator circuit and a resistance-removing good/bad display circuit; wherein the combined multiplexing switch control circuit comprises a 74LS390 counter and a 74LS138 decoder; the row-resistance good-bad display circuit comprises a 74LS194 shift register I, a 74LS194 shift register II and an LED indicator lamp. According to the invention, through comparing the voltages of the pins inserted into the resistor bank one by one, the quality of each pin of the resistor bank can be visually reflected through the on-off condition of the LED indicator lamp, when the resistor is damaged, the corresponding LED indicator lamp emits light, the resistance quality condition of the specific pin in the resistor bank can be automatically, quickly, accurately and intuitively detected, and the resistor bank quality can be conveniently and quickly detected.
Description
Technical Field
The invention relates to a device for detecting whether resistance is good or not, and belongs to the technical field of electronics.
Background
The resistor has the advantages of convenient assembly, high installation density and the like, and is widely applied to televisions, computer mainboards and household appliances at present. At present, when repairing related electrical appliances, the quality of the discharge resistance needs to be detected, the traditional method for detecting the quality of the discharge resistance detects each pin one by using a universal meter, the detection accuracy is not high, the detection needs to be carried out for multiple times, and the efficiency is low.
Disclosure of Invention
The invention aims to solve the technical problems that: the invention provides a device for detecting the resistance of an exclusion, which is used for solving the problem that the resistance of the exclusion is difficult to detect, and can automatically, quickly, accurately and intuitively detect the resistance of a specific pin in the exclusion.
The technical scheme of the invention is as follows: the device comprises a resistor-removing socket 1, a combined multi-way switch circuit 2, a combined multi-way switch control circuit 3, a window voltage comparator 4, a 555 multivibrator circuit 5 and a resistor-removing good-bad display circuit 6; wherein the combined multiplexing switch control circuit 3 comprises a 74LS390 counter 8 and a 74LS138 decoder 7; the arrangement resistance good/bad display circuit 6 comprises a 74LS194 shift register I, a 74LS194 shift register II and an LED indicator lamp; the array block socket 1 is connected with the combined multi-way switch circuit 2, the 74LS390 counter 8, the 74LS138 decoder 7 and the combined multi-way switch circuit 2 are sequentially connected, the combined multi-way switch circuit 2, the window voltage comparators 4, the 74LS194 shift registers I and II and the LED indicator lamp are sequentially connected, and the 555 multivibrator circuit 5 is respectively connected with the 74LS194 shift registers I and II and the 74LS390 counter 8 and respectively provides clock pulses for the combined multi-way switch circuit 2 and the window voltage comparators 4 and 74LS194 shift registers I and II and the LED indicator lamp;
the sockets 0 to 7 of the resistance socket 1 are respectively connected with the emitters of PNP triodes T0 to T7 in the combined multi-way switch circuit 2, and the socket 8 of the resistance socket 1 is connected with a +5V power supply;
the combined multi-way switch circuit 2 comprises PNP type triodes T0, T1, T2, T3, T4, T5, T6 and T7, bases of the PNP type triodes T0, T1, T2, T3, T4, T5, T6 and T7 are respectively connected with a 15 pin, a 14 pin, a 13 pin, a 12 pin, a 11 pin, a 10 pin, a 9 pin and a 7 pin of the 74LS138 decoder 7, and collectors of the PNP type triodes T0-T7 are connected with an input end of the window voltage comparator 4;
the pin 1 of the 74LS390 counter 8 is connected with the collector of the PNP triode T8, the pin 7 is connected with the base of the PNP triode T8, the pin 2 is connected with the output end of the NOT gate N1, and the input end of the NOT gate N1 is grounded through a reset switch K; the 3 pin and the 4 pin of the 74LS390 counter 8 are connected with the 1 pin of the 74LS138 decoder 7, and the 5 pin and the 6 pin of the 74LS390 counter 8 are respectively connected with the 2 pin and the 3 pin of the 74LS138 decoder 7; pin 6 of the 74LS138 decoder 7 is connected with a +5V power supply, and pins 4 and 5 are grounded;
the window voltage comparator 4 comprises resistors R10, R11, R12, R13 and a potentiometerVoltage comparators A1, A2, diodes D3, D4; wherein the non-inverting input terminal of the voltage comparator A1 and the inverting input terminal of the voltage comparator A2 are simultaneously connected with the potentiometerIs connected to one end of the window voltage comparator 4, potentiometer +.>The other end of the pin is grounded to the sliding end; the inverting input end of the voltage comparator A1 is respectively connected with one ends of a resistor R10 and a resistor R11, the other end of the resistor R10 is connected with a +5V power supply, the other end of the resistor R11 is respectively connected with one end of a resistor R12 and the non-inverting input end of the voltage comparator A2, and the other end of the resistor R12 is grounded; the output ends of the voltage comparators A1 and A2 are respectively connected with the anodes of the diodes D3 and D4, and the cathodes of the diodes D3 and D4 are simultaneously connected with the pin 2 of the 74LS194 register I and are grounded through a resistor R13;
the resistance-removing good-bad display circuit 6 also comprises resistors R0, R1, R2, R3, R4, R5, R6 and R7, and LED indicator lamps L0, L1, L2, L3, L4, L5, L6 and L7; the other ends of the resistors R0, R1, R2, R3, R4, R5, R6 and R7 are respectively connected with anodes of LED indicator lamps L0, L1, L2, L3, L4, L5, L6 and L7, and cathodes of the LED indicator lamps L0, L1, L2, L3, L4, L5 and L7 are grounded; pin 12 of the 74LS194 shift register I is connected with pin 2 of the 74LS194 shift register II; the 1 pin of the 74LS194 shift register I and the 1 pin of the 74LS194 shift register II are grounded through a reset switch K, the 9 pin of the 74LS194 shift register I and the 9 pin of the 74LS194 shift register II are connected with a +5V power supply, the 10 pin of the 74LS194 shift register I and the 10 pin of the 74LS194 shift register II are grounded, and the 11 pin of the 74LS194 shift register I and the 11 pin of the 74LS194 shift register II are connected with a collector electrode of the PNP triode T8.
The 555 multivibrator circuit 5 comprises a 555 chip, resistors R8 and R9, capacitors C1 and C2 and diodes D1 and D2; the 1 foot of 555 chip is grounded, 2 feet and 5 feet are connected with the ground through electric capacity C1, C2 respectively, 8 feet, 4 feet are connected with +5V power, 7 feet are connected with +5V power through resistance R8, 7 feet are connected with the positive pole of diode D1, the negative pole of diode D1 is connected with 6 feet and 2 feet of chip, diode D2 is parallelly connected at 2 feet and 7 feet of 555 chip after establishing ties with resistance R9, 3 feet of 555 chip are connected with PNP triode T8's projecting pole.
The working principle of the invention is as follows:
inserting the resistor to be tested, and connecting the voltage deviceThe resistance value is adjusted to be the same as the measured resistance value of the row; the 74LS390 counter 8 is powered on and works in a decimal counting state, and the counting output end is: the output of the pin 7, the pin 3, the pin 5 and the pin 6 is low level, at this time, the PNP triode T8 connected with the pin 7 is conducted, and the clock pulse signal generated by the 555 multivibrator circuit 5 is respectively supplied to the shift register I of the counter 8 of the 74LS390 and the shift register II of the shift register I of the 74LS194 through the triode emitter; the counting signal generated by the 74LS390 counter 8 is used as an address signal to be output to the L4LS138 decoder 7, the L4LS138 decoder 7 outputs a decoding signal to the multi-way switch circuit 2 according to the address signal, PNP type triodes in the multi-way switch circuit 2 are sequentially conducted, each pin of the resistor is sequentially connected to the window voltage comparator 4, and each pin of the resistor is connected to the window voltage comparator 4 and then is connected with the potentiometer->The voltage is equally divided, and in the window voltage comparator 4, the +5V power supply is divided by the resistors R10, R11 and R12 to obtain the reference voltage +.>And->When the voltage of the access pin is between the reference voltage +.>And->The window voltage comparator 4 outputs a low level signal during the time between the two; when the voltage of the access pin is greater than the reference voltage +.>Or less than the reference voltage->When the window voltage comparator 4 outputs a high level signal; the high-low level signals output by the window voltage comparator 4 are registered in a 74LS194 shift register I connected with the window voltage comparator 4, the input high-low level signals are sequentially shifted to one bit right by the 74LS194 shift registers I and 74LS194 shift register II under the action of clock pulses after each comparison of the voltage signals of one resistor discharge pin, and finally, 8 level signals representing the resistor discharge 8 pins are sequentially shifted to the output ends of the corresponding 74LS194 shift registers I and 74LS194 shift register II right, so that the condition of the resistor discharge 8 pins is reflected through the condition of on-off of the corresponding LED indicator lamps;
in the window voltage comparator 4, the common end of the resistor discharging is connected with a +5V power supply, and the resistor discharging pin is connected with the window voltage comparator 4 and then passes through a potentiometerGrounding, when the pin resistor is not damaged, it is combined with potentiometer>Equally dividing the voltage, wherein the input comparison voltage value is +2.5V, which is between the reference voltage +.>=3.75v and ∈>Between=1.25v, the window voltage comparator 4 outputs a low level signal to the 74LS194 shift register i, corresponding to the LED indicator not emitting light; when the access pin resistor is damaged, the access resistor is in short circuit or open circuit, and the input comparison voltage values are +5V and 0V respectively and are larger than the reference voltage +.>=3.75v and less than the reference voltage +.>The window voltage comparator 4 outputs a high-level signal to the 74LS194 shift register I, corresponding to the luminous prompt of the LED indicator lamp;
under the clock pulse of the 555 multivibrator circuit 5, after the 74LS390 counter 8 generates 8 counting signals, the detection of resistances of the 8 pins of the resistor bank is completed, at the moment, the 7 pin output of the 74LS390 counter 8 is high level, the PNP triode T8 connected with the 7 pin is cut off, the clock pulse provided by the 555 multivibrator circuit 5 is cut off, the 74LS390 counter 8 stops counting, the 74LS194 shift registers I and 74LS194 shift register II keep the current output state and do not move to the right any more, and when the resistance pin is observed to emit light corresponding to the LED indicator lamp, the resistance of the pin is indicated to be damaged;
after finishing one-time resistance discharge detection, inserting a new resistance discharge to be detected, pressing a reset switch K, and resetting a grounding signal to a 1-pin reset end of a 74LS194 shift register I and a 1-pin reset end of a 74LS194 shift register II through the reset switch K, wherein the 74LS194 shift registers I and the 74LS194 shift register II are cleared under the action of a reset signal; meanwhile, the grounding signal is turned over by the NOT gate N1 and then outputs a high level to the 2-pin reset end of the 74LS390 counter 8 connected with the NOT gate output end, and the 74LS390 counter 8 is reset under the action of the reset signal; at this time, the output of pin 7 of the 74LS390 counter 8 is low, the PNP triode T8 connected with pin 7 is conducted, and the shift registers I and II of the 74LS390 counter 8 and 74LS194 circularly work under the clock pulse signal generated by the 555 multivibrator circuit 5 to detect the exclusion pin.
The beneficial effects of the invention are as follows:
according to the invention, through comparing the voltages of the pins inserted into the resistor bank one by one, the quality of each pin of the resistor bank can be visually reflected through the on-off condition of the LED indicator lamp, when the resistor is damaged, the corresponding LED indicator lamp emits light, the resistance quality condition of the specific pin in the resistor bank can be automatically, quickly, accurately and intuitively detected, and the resistor bank quality can be conveniently and quickly detected.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
The reference numerals in fig. 1: 1-row block socket, 2-combination multi-way switch circuit, 3-combination multi-way switch control circuit, 4-window voltage comparator, 5-555 multi-resonant circuit, 6-row block good/bad display circuit, 7-74LS138 decoder, 8-74LS390 counter, T0-T8-PNP triode,-potentiometer, A1-A2-voltage comparator, D1-D4-diode, N1-NOT gate, R0-R13-resistor, C1-C2-capacitor, L0-L7-LED indicator lamp, K-reset switch.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Example 1: as shown in figure 1, the device for detecting the quality of the exclusion comprises an exclusion socket 1, a combined multi-way switch circuit 2, a combined multi-way switch control circuit 3, window voltage comparators 4 and 555 multivibrator circuits 5 and an exclusion quality display circuit 6; wherein the combined multiplexing switch control circuit 3 comprises a 74LS390 counter 8 and a 74LS138 decoder 7; the arrangement resistance good/bad display circuit 6 comprises a 74LS194 shift register I, a 74LS194 shift register II and an LED indicator lamp; the array block socket 1 is connected with the combined multi-way switch circuit 2, the 74LS390 counter 8, the 74LS138 decoder 7 and the combined multi-way switch circuit 2 are sequentially connected, the combined multi-way switch circuit 2, the window voltage comparators 4, the 74LS194 shift registers I and II and the LED indicator lamp are sequentially connected, and the 555 multivibrator circuit 5 is respectively connected with the 74LS194 shift registers I and II and the 74LS390 counter 8 and respectively provides clock pulses for the combined multi-way switch circuit 2 and the window voltage comparators 4 and 74LS194 shift registers I and II and the LED indicator lamp;
the sockets 0 to 7 of the resistance socket 1 are respectively connected with the emitters of PNP triodes T0 to T7 in the combined multi-way switch circuit 2, and the socket 8 of the resistance socket 1 is connected with a +5V power supply;
the combined multi-way switch circuit 2 comprises PNP type triodes T0, T1, T2, T3, T4, T5, T6 and T7, bases of the PNP type triodes T0, T1, T2, T3, T4, T5, T6 and T7 are respectively connected with a 15 pin, a 14 pin, a 13 pin, a 12 pin, a 11 pin, a 10 pin, a 9 pin and a 7 pin of the 74LS138 decoder 7, and collectors of the PNP type triodes T0-T7 are connected with an input end of the window voltage comparator 4;
the pin 1 of the 74LS390 counter 8 is connected with the collector of the PNP triode T8, the pin 7 is connected with the base of the PNP triode T8, the pin 2 is connected with the output end of the NOT gate N1, and the input end of the NOT gate N1 is grounded through a reset switch K; the 3 pin and the 4 pin of the 74LS390 counter 8 are connected with the 1 pin of the 74LS138 decoder 7, and the 5 pin and the 6 pin of the 74LS390 counter 8 are respectively connected with the 2 pin and the 3 pin of the 74LS138 decoder 7; pin 6 of the 74LS138 decoder 7 is connected with a +5V power supply, and pins 4 and 5 are grounded;
the window voltage comparator 4 comprises resistors R10, R11, R12, R13 and a potentiometerVoltage comparators A1, A2, diodes D3, D4; wherein the non-inverting input terminal of the voltage comparator A1 and the inverting input terminal of the voltage comparator A2 are simultaneously connected with the potentiometerIs connected to one end of the window voltage comparator 4, potentiometer +.>The other end of the pin is grounded to the sliding end; the inverting input end of the voltage comparator A1 is respectively connected with one end of a resistor R10 and one end of a resistor R11, the other end of the resistor R10 is connected with a +5V power supply, and the other end of the resistor R11 is respectively connected with one end of a resistor R12The terminal and the non-inverting input terminal of the voltage comparator A2 are connected, and the other end of the resistor R12 is grounded; the output ends of the voltage comparators A1 and A2 are respectively connected with the anodes of the diodes D3 and D4, and the cathodes of the diodes D3 and D4 are simultaneously connected with the pin 2 of the 74LS194 register I and are grounded through a resistor R13;
the resistance-removing good-bad display circuit 6 also comprises resistors R0, R1, R2, R3, R4, R5, R6 and R7, and LED indicator lamps L0, L1, L2, L3, L4, L5, L6 and L7; the other ends of the resistors R0, R1, R2, R3, R4, R5, R6 and R7 are respectively connected with anodes of LED indicator lamps L0, L1, L2, L3, L4, L5, L6 and L7, and cathodes of the LED indicator lamps L0, L1, L2, L3, L4, L5 and L7 are grounded; pin 12 of the 74LS194 shift register I is connected with pin 2 of the 74LS194 shift register II; the 1 pin of the 74LS194 shift register I and the 1 pin of the 74LS194 shift register II are grounded through a reset switch K, the 9 pin of the 74LS194 shift register I and the 9 pin of the 74LS194 shift register II are connected with a +5V power supply, the 10 pin of the 74LS194 shift register I and the 10 pin of the 74LS194 shift register II are grounded, and the 11 pin of the 74LS194 shift register I and the 11 pin of the 74LS194 shift register II are connected with a collector electrode of the PNP triode T8.
Further, the 555 multivibrator circuit 5 comprises a 555 chip, resistors R8 and R9, capacitors C1 and C2, and diodes D1 and D2; the 1 foot of 555 chip is grounded, 2 feet and 5 feet are connected with the ground through electric capacity C1, C2 respectively, 8 feet, 4 feet are connected with +5V power, 7 feet are connected with +5V power through resistance R8, 7 feet are connected with the positive pole of diode D1, the negative pole of diode D1 is connected with 6 feet and 2 feet of chip, diode D2 is parallelly connected at 2 feet and 7 feet of 555 chip after establishing ties with resistance R9, 3 feet of 555 chip are connected with PNP triode T8's projecting pole.
The specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (1)
1. An arrangement resistance quality detection device is characterized in that: the device comprises a resistance-removing socket (1), a combined multi-way switch circuit (2), a combined multi-way switch control circuit (3), a window voltage comparator (4), a 555 multivibrator circuit (5) and a resistance-removing good/bad display circuit (6); wherein the combined multiplexing switch control circuit (3) comprises a 74LS390 counter (8) and a 74LS138 decoder (7); the arrangement resistance good/bad display circuit (6) comprises a 74LS194 shift register I, a 74LS194 shift register II and an LED indicator lamp; the array block socket (1) is connected with the combined multi-way switch circuit (2), the 74LS390 counter (8), the 74LS138 decoder (7) and the combined multi-way switch circuit (2) are sequentially connected, the combined multi-way switch circuit (2), the window voltage comparator (4), the 74LS194 shift register I, the 74LS194 shift register II and the LED indicator lamp are sequentially connected, and the 555 multivibrator circuit (5) is respectively connected with the 74LS194 shift register I, the 74LS194 shift register II and the 74LS390 counter (8) and respectively provides clock pulses for the same;
the sockets No. 0 to No. 7 of the resistance-removing socket (1) are respectively connected with the emitters of PNP triodes T0 to T7 in the combined multi-way switch circuit (2), and the socket No. 8 of the resistance-removing socket (1) is connected with a +5V power supply;
the combined multi-way switch circuit (2) comprises PNP type triodes T0, T1, T2, T3, T4, T5, T6 and T7, bases of the PNP type triodes T0, T1, T2, T3, T4, T5, T6 and T7 are respectively connected with pins 15, 14, 13, 12, 11, 10, 9 and 7 of a 74LS138 decoder (7), and collectors of the PNP type triodes T0-T7 are connected with an input end of a window voltage comparator (4);
the 1 pin of the 74LS390 counter (8) is connected with the collector electrode of the PNP triode T8, the 7 pin is connected with the base electrode of the PNP triode T8, the 2 pin is connected with the output end of the NOT gate N1, and the input end of the NOT gate N1 is grounded through a reset switch K; the 3 pin and the 4 pin of the 74LS390 counter (8) are connected with the 1 pin of the 74LS138 decoder (7), and the 5 pin and the 6 pin of the 74LS390 counter (8) are respectively connected with the 2 pin and the 3 pin of the 74LS138 decoder (7); the pin 6 of the 74LS138 decoder (7) is connected with a +5V power supply, and the pin 4 and the pin 5 are grounded;
the window voltage comparator (4) comprises resistors R10, R11, R12, R13 and a potentiometerVoltage comparators A1, A2, diodes D3, D4; wherein the non-inverting input terminal of the voltage comparator A1 and the inverting input terminal of the voltage comparator A2 are simultaneously connected with the potentiometerIs connected to one end of a window voltage comparator (4), a potentiometer +.>The other end of the pin is grounded to the sliding end; the inverting input end of the voltage comparator A1 is respectively connected with one ends of a resistor R10 and a resistor R11, the other end of the resistor R10 is connected with a +5V power supply, the other end of the resistor R11 is respectively connected with one end of a resistor R12 and the non-inverting input end of the voltage comparator A2, and the other end of the resistor R12 is grounded; the output ends of the voltage comparators A1 and A2 are respectively connected with the anodes of the diodes D3 and D4, and the cathodes of the diodes D3 and D4 are simultaneously connected with the pin 2 of the 74LS194 register I and are grounded through a resistor R13;
the resistance-removing good-bad display circuit (6) further comprises resistors R0, R1, R2, R3, R4, R5, R6, R7, LED indicator lamps L0, L1, L2, L3, L4, L5, L6 and L7; the other ends of the resistors R0, R1, R2, R3, R4, R5, R6 and R7 are respectively connected with anodes of LED indicator lamps L0, L1, L2, L3, L4, L5, L6 and L7, and cathodes of the LED indicator lamps L0, L1, L2, L3, L4, L5 and L7 are grounded; pin 12 of the 74LS194 shift register I is connected with pin 2 of the 74LS194 shift register II; the 1 pin of the 74LS194 shift register I and the 1 pin of the 74LS194 shift register II are grounded through a reset switch K, the 9 pin of the 74LS194 shift register I and the 9 pin of the 74LS194 shift register II are connected with a +5V power supply, the 10 pin of the 74LS194 shift register I and the 10 pin of the 74LS194 shift register II are grounded, and the 11 pin of the 74LS194 shift register I and the 11 pin of the 74LS194 shift register II are connected with a collector electrode of a PNP triode T8;
the 555 multivibrator circuit (5) comprises a 555 chip, resistors R8 and R9, capacitors C1 and C2 and diodes D1 and D2; the 1 pin and the 5 pin of the 555 chip are grounded, the 2 pin and the 5 pin are respectively connected with a grounding end through capacitors C1 and C2, the 8 pin and the 4 pin are connected with a +5V power supply, the 7 pin is connected with the +5V power supply through a resistor R8, the 7 pin is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the 6 pin and the 2 pin of the chip, the diode D2 is connected with the resistor R9 in series and then connected with the 2 pin and the 7 pin of the 555 chip in parallel, and the 3 pin of the 555 chip is connected with the emitter of a PNP triode T8;
inserting the resistor to be tested, and connecting the voltage deviceThe resistance value is adjusted to be the same as the measured resistance value of the row; the 74LS390 counter (8) is powered on and works in a decimal counting state, and the counting output end is: the output of the pin 7, the pin 3, the pin 5 and the pin 6 is low level, at the moment, a PNP triode T8 connected with the pin 7 is conducted, and clock pulse signals generated by a 555 multivibrator circuit (5) are respectively supplied to a 74LS390 counter (8), a 74LS194 shift register I and a 74LS194 shift register II through triode emitters; the counting signal generated by the 74LS390 counter (8) is used as an address signal to be output to the L4LS138 decoder (7), the L4LS138 decoder (7) outputs a decoding signal to the multi-way switch circuit (2) according to the address signal, PNP type triodes in the multi-way switch circuit (2) are sequentially conducted, each pin of the resistor is sequentially connected to the window voltage comparator (4), and each pin of the resistor is connected to the window voltage comparator (4) and then connected to the potentiometer->The voltage is equally divided, and in the window voltage comparator (4), the +5V power supply is divided by the resistors R10, R11 and R12 to obtain the reference voltage +.>And->When the voltage of the access pin is between the reference voltage +.>And->The window voltage comparator (4) outputs a low-level signal during the time; when the voltage of the access pin is greater than the reference voltage +.>Or less than the reference voltage->When the window voltage comparator (4) outputs a high level signal; the high-low level signals output by the window voltage comparator (4) are registered in a 74LS194 shift register I connected with the window voltage comparator, the window voltage comparator (4) compares the voltage signals of each resistor-array pin, the 74LS194 shift registers I and 74LS194 shift register II sequentially shift the input high-low level signals to one bit right under the action of clock pulses, and finally, 8 level signals representing the 8 pins of resistor-array are sequentially shifted to the output ends of the corresponding 74LS194 shift registers I and 74LS194 shift register II right, so that the condition of the 8 pins of resistor-array is reflected through the condition of on-off of the corresponding LED indicator lamps;
in the window voltage comparator (4), the common end of the resistor is connected with a +5V power supply, and the resistor pin is connected with the window voltage comparator (4) and then passes through a potentiometerGrounding, when the pin resistor is not damaged, it is combined with potentiometer>Equally dividing the voltage, wherein the input comparison voltage value is +2.5V and is betweenReference voltage->=3.75v and ∈>Between=1.25v, the window voltage comparator (4) outputs a low level signal to the 74LS194 shift register i, corresponding to the LED indicator light not emitting light; when the access pin resistor is damaged, the access resistor is in short circuit or open circuit, and the input comparison voltage values are +5V and 0V respectively and are larger than the reference voltage +.>=3.75v and less than the reference voltage +.>The window voltage comparator (4) outputs a high-level signal to the 74LS194 shift register I, and the corresponding LED indicator light emits light to prompt;
under the clock pulse of the 555 multivibrator circuit (5), after the 74LS390 counter (8) generates 8 counting signals, the detection of the resistances of the 8 pins is completed, at the moment, the 7 pin output of the 74LS390 counter (8) is high level, the PNP triode T8 connected with the 7 pin is cut off, the clock pulse provided by the 555 multivibrator circuit (5) is cut off, the 74LS390 counter (8) stops counting, the 74LS194 shift registers I and 74LS194 shift register II keep the current output state and do not move to the right any more, and when the LED indicating lamp corresponding to the resistance pin is observed to emit light, the resistance of the pin is indicated to be damaged;
after finishing one-time resistance discharge detection, inserting a new resistance discharge to be detected, pressing a reset switch K, and resetting a grounding signal to a 1-pin reset end of a 74LS194 shift register I and a 1-pin reset end of a 74LS194 shift register II through the reset switch K, wherein the 74LS194 shift registers I and the 74LS194 shift register II are cleared under the action of a reset signal; meanwhile, the grounding signal is turned over by the NOT gate N1 and then outputs a high level to the 2-pin reset end of the 74LS390 counter (8) connected with the NOT gate output end, and the 74LS390 counter (8) is counted and cleared under the action of the reset signal; at this time, the output of pin 7 of the 74LS390 counter (8) is low, the PNP triode T8 connected with pin 7 is conducted, and the shift registers I and II of the 74LS390 counter (8), 74LS194 and 74LS194 circularly work under the clock pulse signals generated by the 555 multivibrator circuit (5) to detect the resistance-removing pins.
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| CN201810216632.XA CN108254645B (en) | 2018-03-16 | 2018-03-16 | Device for detecting resistance of discharge |
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| CN201810216632.XA CN108254645B (en) | 2018-03-16 | 2018-03-16 | Device for detecting resistance of discharge |
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| CN108254645A CN108254645A (en) | 2018-07-06 |
| CN108254645B true CN108254645B (en) | 2023-09-29 |
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